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(a) Expected pathway for FSA-mediated PP chemical modification. Optical and scanning electron microscopy (SEM) images of (b) a mask filter, and sulfonated mask filters treated with FSA for (c) 2 min, (D) 4 min, and (e) 6 min—Reproduced from the study by Kim et al. [52∗], Copyright 2021, with permission from Elsevier.
